Method of manufacturing light emitting device
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H01L-033/50
C09K-011/00
H01L-021/00
출원번호
US-0340171
(2014-07-24)
등록번호
US-9293666
(2016-03-22)
우선권정보
KR-10-2013-0153213 (2013-12-10)
발명자
/ 주소
Lee, In Hyung
Park, Jong Won
Won, Hyong Sik
Yoon, Chul Soo
Lee, Dong Hoon
출원인 / 주소
Samsung Electronics Co., Ltd.
대리인 / 주소
McDermott Will & Emery LLP
인용정보
피인용 횟수 :
0인용 특허 :
39
초록▼
There is provided a method of manufacturing a light emitting device which includes preparing a light emitting element emitting excitation light and a substrate on which the light emitting element is disposed. A fluoride phosphor is provided to absorb excitation light emitted from the light emitting
There is provided a method of manufacturing a light emitting device which includes preparing a light emitting element emitting excitation light and a substrate on which the light emitting element is disposed. A fluoride phosphor is provided to absorb excitation light emitted from the light emitting element to emit visible light, and is represented by Chemical Formula (1). The fluoride phosphor is disposed on at least one of the light emitting element and the substrate, wherein Chemical Formula (1): AxMFy:Mn4+ (wherein 2≦x≦3 and 4≦y≦7, A is at least one element selected from the group consisting of Li, Na, K, Rb, and Cs, and M is at least one element selected from the group consisting Si, Ti, Zr, Hf, Ge, and Sn).
대표청구항▼
1. A method of manufacturing a light emitting device, the method comprising: preparing a light emitting element emitting excitation light and a substrate on which the light emitting element is disposed;preparing a fluoride phosphor absorbing excitation light emitted from the light emitting element t
1. A method of manufacturing a light emitting device, the method comprising: preparing a light emitting element emitting excitation light and a substrate on which the light emitting element is disposed;preparing a fluoride phosphor absorbing excitation light emitted from the light emitting element to emit visible light, represented by Chemical Formula (1):Chemical Formula (1): AxMFy:Mn4+ wherein 2≦x≦3 and 4≦y≦7, A is at least one element selected from the group consisting of Li, Na, K, Rb, and Cs, and M is at least one element selected from the group consisting Si, Ti, Zr, Hf, Ge, and Sn; anddisposing the fluoride phosphor on at least one of the light emitting element and the substrate, wherein:the preparing of the fluoride phosphor represented by the Chemical Formula (1) comprises:preparing a first aqueous solution including at least one of K2MnF6 and Na2MnF6, including: dissolving KHF2 powder or NaHF2 powder, and, KMnO4 powder or NaMnO4 powder in the hydrofluoric acid aqueous solution;adding hydrogen peroxide to the product generated by the dissolving operation to form a second precipitate; andstirring the second precipitate in the hydrofluoric acid aqueous solution to remove the KHF2 powder or NaHF2 powder remaining in the second precipitate;forming a first precipitate using the first aqueous solution, a first raw material containing M and a second raw material containing A;washing the first precipitate with at least a 40 wt % hydrofluoric acid aqueous solution; anddrying the washed first precipitate. 2. The method of claim 1, wherein the first aqueous solution is a first hydrofluoric acid aqueous solution having at least one of KMnF6 and NaMnF6 dissolved therein. 3. A method of manufacturing a light emitting device, the method comprising: preparing a light emitting element emitting excitation light and a substrate on which the light emitting element is disposed;preparing a fluoride phosphor absorbing excitation light emitted from the light emitting element to emit visible light, represented by Chemical Formula (1):Chemical Formula (1): AxMFy:Mn4+ wherein 2≦x≦3 and 4≦y≦7, A is at least one element selected from the group consisting of Li, Na, K, Rb, and Cs, and M is at least one element selected from the group consisting Si, Ti, Zr, Hf, Ge, and Sn; anddisposing the fluoride phosphor on at least one of the light emitting element and the substrate, wherein:the preparing of the fluoride phosphor represented by the Chemical Formula (1) comprises:preparing a first aqueous solution including at least one of K2MnF6 and Na2MnF6, first aqueous solution being a first hydrofluoric acid aqueous solution having at least one of KMnF6 and NaMnF6 dissolved therein;forming a first precipitate using the first aqueous solution, a first raw material containing M and a second raw material containing A, by stirring the first raw material in the first hydrofluoric acid aqueous solution and by adding the second raw material to the product generated by the stirring operation to form the first precipitate;washing the first precipitate with at least a 40 wt % hydrofluoric acid aqueous solution; anddrying the washed first precipitate. 4. The method of claim 1, wherein the fluoride phosphor represented by Chemical Formula (1) has: an absorption rate equal to or greater than 0.75,an internal quantum efficiency equal to or greater than 0.75, andan external quantum efficiency equal to or greater than 0.65, with respect to excitation light having a wavelength of 450 nm. 5. The method of claim 1, further comprising: coating surfaces of fluoride phosphor particles represented by the Chemical Formula (1) with at least one of a silicon oxide and a metal oxide, after the drying operation. 6. The method of claim 5, wherein the coating comprises: preparing an alcohol-based solvent with a polymer dissolved therein;stirring the prepared alcohol-based solvent and the fluoride phosphor represented by the Chemical Formula (1);adding a basic aqueous solution including at least one of a silicon oxide precursor and a metal oxide precursor to the stirred product and stirring the same to form a third precipitate; andheating the third precipitate. 7. The method of claim 1, further comprising: coating surfaces of fluoride phosphor particles represented by Chemical Formula (1) with an organic substance, after the drying operation. 8. The method of claim 7, wherein the coating comprises: mixing the fluoride phosphor represented by the Chemical Formula (1) in an organic solvent;adding an organic precursor to the mixing product, and stirring the same to form a fourth precipitate; andwashing the fourth precipitate. 9. The method of claim 1, wherein the substrate has a first surface on which the light emitting element is disposed, the method further comprising mounting the light emitting element on the first surface of the substrate,wherein the disposing of the fluoride phosphor on at least one of the light emitting element and the substrate comprises:disposing a lower filler on the first substrate of the substrate on which the light emitting element is disposed;disposing a wavelength converter on the lower filler such that the wavelength converter is separated from the first surface by the lower filler, the wavelength converter including the prepared fluoride phosphor; anddisposing a cover on the wavelength converter,wherein the wavelength converter is sealed by at least one of the substrate, the lower filler, and the cover. 10. The method of claim 9, wherein the lower filler is a first resin layer including a resin, and wherein the wavelength converter includes:the prepared fluoride phosphor represented by the Chemical Formula (1) and a second resin layer having the prepared fluoride phosphor represented by the Chemical Formula (1) dispersed therein, andresin materials constituting the first and second resin layers have different refractive indices. 11. The method of claim 10, wherein the resin material of the first resin layer has a refractive index greater than that of the resin material of the second resin layer. 12. The method of claim 9, further comprising: forming a moisture-proof coating on the first surface of the substrate, before the disposing of the lower filler. 13. The method of claim 12, wherein the moisture-proof coating includes at least one of a fluorine-based and a silica-based coating agent. 14. The method of claim 9, wherein the cover is formed of a material including glass. 15. The method of claim 14, wherein, in the forming of the cover, the cover is disposed on the upper surface and the lateral surfaces of the wavelength converter to cover the upper surface and the lateral surfaces of the wavelength converter. 16. The method of claim 9, wherein the lower filler and the cover are formed of an inorganic substance. 17. The method of claim 16, wherein the forming of the cover comprises: disposing a first cover on the wavelength converter; anddisposing a second cover including a resin on the first cover. 18. The method of claim 17, wherein the second cover includes first and second layers, wherein: the first layer includes methyl-based silicone, andthe second layer includes phenyl-based silicone. 19. A method of manufacturing a light emitting device, the method comprising: preparing a light emitting element emitting excitation light and a substrate on which the light emitting element is disposed;preparing a fluoride phosphor absorbing excitation light emitted from the light emitting element to emit visible light, represented by Chemical Formula (1):Chemical Formula (1): AxMFy:Mn4+ wherein 2≦x≦3 and 4≦y≦7, A is at least one element selected from the group consisting of Li, Na, K, Rb, and Cs, and M is at least one element selected from the group consisting Si, Ti, Zr, Hf, Ge, and Sn; anddisposing the fluoride phosphor on at least one of the light emitting element and the substrate,wherein the preparing of the fluoride phosphor represented by the Chemical Formula (1) comprises:preparing a first aqueous solution including at least one of K2MnF6 and Na2MnF6, including: dissolving KHF2 powder or NaHF2 powder, and, KMnO4 powder or NaMnO4 powder in the hydrofluoric acid aqueous solution;adding hydrogen peroxide to the product generated by the dissolving operation to form a second precipitate; andstirring the second precipitate in the hydrofluoric acid aqueous solution to remove the KHF2 powder or NaHF2 powder remaining in the second precipitate;forming a first precipitate using the first aqueous solution, a first raw material containing M and a second raw material containing A;drying the first precipitate; andcoating surfaces of particles of the dried first precipitate with at least one of a silicon oxide, a metal oxide, and an organic substance.
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